<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>

<body>
  <style>
    td{
      border: 1px solid #000;
      padding: 5px 10px;
    }
  </style>
  <table>
    <tr>
      <td>班级</td>
      <td>学生</td>
      <td>班主任</td>
    </tr>
  </table>
</body>
</html>